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<title>Sequential Function Chart</title>
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          <h1 class="mb-0 p-1 ">GoJS</h1>
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    <!-- Start of GoJS sample code -->
    
    <script src="../release/go.js"></script>
    <div class="p-4 w-full">
    <script id="code">
    function init() {
      var $ = go.GraphObject.make;

      myDiagram =
        $(go.Diagram, "myDiagramDiv", // must be the ID or reference to an HTML DIV
          {
            layout: $(go.LayeredDigraphLayout, { direction: 90, layerSpacing: 10, setsPortSpots: false }),
            "undoManager.isEnabled": true  // enable undo & redo
          });

      // when the document is modified, add a "*" to the title and enable the "Save" button
      myDiagram.addDiagramListener("Modified", function(e) {
        var button = document.getElementById("SaveButton");
        if (button) button.disabled = !myDiagram.isModified;
        var idx = document.title.indexOf("*");
        if (myDiagram.isModified) {
          if (idx < 0) document.title += "*";
        } else {
          if (idx >= 0) document.title = document.title.substr(0, idx);
        }
      });

      // define the step Node template
      myDiagram.nodeTemplateMap.add("step",
        $(go.Node, "Spot",
          { locationSpot: go.Spot.Center },
          new go.Binding("location", "loc", go.Point.parse).makeTwoWay(go.Point.stringify),
          $(go.Shape, "Rectangle",
            {
              fill: "whitesmoke",
              stroke: "gray",
              strokeWidth: 2,
              desiredSize: new go.Size(160, 60),
              portId: "",  // so that links connect to the Shape, not to the whole Node
              fromSpot: go.Spot.BottomSide,
              toSpot: go.Spot.TopSide,
              alignment: go.Spot.Center
            }),
          $(go.TextBlock,
            {
              font: "bold 16px sans-serif",
              alignment: go.Spot.Center,
              wrap: go.TextBlock.WrapFit,
              editable: true
            },
            new go.Binding("text", "text").makeTwoWay())
        ));

      // define the transition Node template.
      myDiagram.nodeTemplateMap.add("transition",
        $(go.Node, "Horizontal",
          { locationSpot: go.Spot.Center, locationObjectName: "BAR" },
          new go.Binding("location", "loc", go.Point.parse).makeTwoWay(go.Point.stringify),
          $(go.Shape, "Rectangle",
            {
              name: "BAR",
              fill: "black",
              stroke: null,
              desiredSize: new go.Size(60, 8),
              portId: "",
              fromSpot: go.Spot.BottomSide,
              toSpot: go.Spot.TopSide
            }),
          $(go.TextBlock,
            { editable: true, margin: 3 },
            new go.Binding("text", "text").makeTwoWay())
        ));

      // define the parallel Node template.
      myDiagram.nodeTemplateMap.add("parallel",
        $(go.Node,
          { locationSpot: go.Spot.Center },
          new go.Binding("location", "loc", go.Point.parse).makeTwoWay(go.Point.stringify),
          $(go.Shape, "Rectangle",
            {
              fill: "whitesmoke",
              stroke: "black",
              fromSpot: go.Spot.Bottom,
              toSpot: go.Spot.Top,
              desiredSize: new go.Size(200, 6),
              portId: "",
              fromSpot: go.Spot.BottomSide,
              toSpot: go.Spot.TopSide
            })
        ));

      // define the Link template
      myDiagram.linkTemplate =
        $(go.Link,
          { routing: go.Link.Orthogonal },
          $(go.Shape,
            { stroke: "black", strokeWidth: 2 })
        );

      // create the graph by reading the JSON data saved in "mySavedModel" textarea element
      load();
    }

    // Show the diagram's model in JSON format
    function save() {
      document.getElementById("mySavedModel").value = myDiagram.model.toJson();
      myDiagram.isModified = false;
    }
    function load() {
      myDiagram.model = go.Model.fromJson(document.getElementById("mySavedModel").value);
    }
    window.addEventListener('DOMContentLoaded', init);
  </script>

<div id="sample">
  <div id="myDiagramDiv" style="border: solid 1px black; width: 100%; height: 600px"></div>
  <p>
    <em>Sequential function charts</em> are used for programmable logic controllers (PLCs) and other control systems.
  </p>
  <p>
    You can edit text in-place by clicking on the text of a selected node. The diagram uses 3 categories of node,
    each added to the <a>Diagram.nodeTemplateMap</a>:
    <ul>
      <li><b>step</b></li>
      <li><b>transition</b></li>
      <li><b>parallel</b></li>
    </ul>
  </p>
  <p>
    See also the <a href="grafcet.html">grafcet diagram sample</a>.
  </p>
  <div>
    <div>
      <button id="SaveButton" onclick="save()">Save</button>
      <button onclick="load()">Load</button>
      Diagram Model saved in JSON format:
    </div>
    <textarea id="mySavedModel" style="width:100%;height:400px">
{ "class": "go.GraphLinksModel",
  "nodeDataArray": [
{"key":"S1", "category":"step", "text":"Step 1"},
{"key":"TR1", "category":"transition", "text":"Transition 1"},
{"key":"S2", "category":"step", "text":"Step 2"},
{"key":"TR2", "category":"transition", "text":"Transition 2"},
{"key":"BAR1", "category":"parallel" },
{"key":"S3", "category":"step", "text":"Step 3"},
{"key":"S4", "category":"step", "text":"Step 4"},
{"key":"BAR2", "category":"parallel" },
{"key":"TR3", "category":"transition", "text":"Transition 3"},
{"key":"S5", "category":"step", "text":"Step 5"}
 ],
  "linkDataArray": [
{"from":"S1", "to":"TR1"},
{"from":"TR1", "to":"S2"},
{"from":"S2", "to":"TR2"},
{"from":"TR2", "to":"BAR1"},
{"from":"BAR1", "to":"S3"},
{"from":"BAR1", "to":"S4"},
{"from":"S3", "to":"BAR2"},
{"from":"S4", "to":"BAR2"},
{"from":"BAR2", "to":"TR3"},
{"from":"TR3", "to":"S5"}
 ]}
    </textarea>
  </div>
</div>
    </div>
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